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No, not missing anything but the actual numbers and I don't really feel like working them out. However, if you are moving a ship of 50k kg's at 99.99% C that will take a specific amount of energy to accelerate and then maintain that speed. If you come upon a mass of 50kg and have to force it our of the way, that will also take a specific amount of energy because of the relativistic speed at which you are approaching the object and the simple fact that it has to be moved, quite possibly at right angles to the direction you are traveling. It wouldn't obviously take as much energy to move the object at 0.1% of your ships mass as it would to change the ship's direction, but it would probably take something in the range of 0.2 to 0.4% of the energy being used by the ship to travel through space for both deflection and course correction (action and reaction).
Cheers - Dave
Agreed, no argument. The original claim was more like "would take more energy than the Universe".
Depending on your final speed close to C, the energy required to move objects out of the way could easily exceed the total energy of the universe.
edit on 19-3-2014 by mbkennel because: (no reason given)